Issue 697333:
Support ORIGIN frame

Issue description

For Internals>Network>HTTP2
See:
http://httpwg.org/http-extensions/origin-frame.html
Compared to 421, ORIGIN removes a RT, allows a definitive set of origins to be associated with a connection, and has clearer semantics.
See also #546991. If you have feedback on the spec, please bring it up; the current version seems to have broad support, but if there are specific needs that Chrome has, we'd love to hear them.